(3bi) Water: -Serves as a habitat for organisms. -Serves as a source of water for irrigation. -Serves as a source of hydroelectric power.

(iii) Forest:-It ensures the conservation of trees or forest product. -It helps to check erosion. -It helps in the preservation of natural spaces.

5a

A scientific theory is a well-substantiated explanation of some aspect of the natural world, based on a body of facts that have been repeatedly confirmed through observation and experiment. Such fact-supported theories are not "guesses" but reliable accounts of the real world.

A hypothesis is a proposed explanation for a phenomenon. For a hypothesis to be a scientific hypothesis, the scientific method requires that one can test it. ... Even though the words "hypothesis" and "theory" are often used synonymously, a scientific hypothesis is not the same as a scientific theory.

5B

Designing the ExperimentThis stage of the scientific method involves designing the steps that will test and evaluate the hypothesis, manipulating one or more variables to generate analyzable data.

ObservationThis is the midpoint of the steps of the scientific method and involves observing and recording the results of the research, gathering the findings into raw data

AnalysisThe scope of the research begins to broaden again, as statistical analyses are performed on the data, and it is organized into an understandable form.

Conclusions and PublishingThis stage is where, technically, the hypothesis is stated as proved or disproved.